Have a 35-kilo giant dog from the animal welfare. Bad past and zero socialization, so it has aggressively responded with anything new. All collars tried, all Erzeihungsmethoden, with that of Cesar Millan hats work. She is not the only dog in the household, so experience abundant, but so a single incident we had not. After the collar arrived immediately created and tested. Dogs gone round in the otherwise only strong Leinenzug was possible. The first dog, slight palpitations, because so far it was just that I get somehow kept the dog, the dog was confused when she got a brief correction by means of the collar, theater not so huge. I drew and continue to run until the next dog came hope. Kurzegfasst, already running an hour later the dog encounters were really very good, little effort, time to correct the dog and learning effect superfix. We now have relaxing walks and I think in the near future without collar. The hinbekommen had no dog trainer with her and now I alone, I can only recommend the collar to anyone. It strengthens its position as pack leader and acting sensational. I'm super happy with it!